Charge Pickup Reaction Cross Section for Neutron-Rich p-Shell Isotopes at 900A MeV

TL;DR

This study measures charge pickup cross sections for various neutron-rich p-shell isotopes at relativistic energies, revealing a universal increase with isospin asymmetry and providing an empirical formulation of the cross sections.

Contribution

It presents the first comprehensive measurement of charge pickup cross sections for multiple p-shell isotopes at 900A MeV and uncovers a universal trend related to isospin asymmetry.

Findings

Charge pickup cross sections increase rapidly with isospin asymmetry.

Cross sections can be separated into contributions from mass number and isospin.

An empirical formula describing the cross sections is proposed.

Abstract

We report charge pickup reaction cross sections for 24 \textit{p}-shell isotopes, including $^{8,9}$Li, $^{10-12}$Be, $^{10,13-15}$B, $^{12,14-19}$C and $^{14,15,17-22}$N, measured at relativistic energies (approximately 900$A$ MeV) on both hydrogen and carbon targets. For the first time, we reveal a universal rapid increase in the charge pickup cross sections of unstable projectiles with isospin asymmetry along several isotopic chains. The cross sections can be decoupled into distinct contributions from the mass number and isospin asymmetry of the projectile, highlighting the critical role of the latter, and can be formulated empirically.